
where \(C_1\)  and \(C_2\)  are constants which depend on the size of the particles. From kinetic theory of gases [1]}, \(C_1\)  and \(C_2\)  can be obtained in \(d\) -dimensions for particles with diameter \(D\)  as
\(C^*_1 &= \frac{S_d}{2dC^{(d)}_D}\sqrt{\frac{mk_B}{\pi ^d}}~ \Gamma \Big (\frac{d+1}{2}\Big ),\\C^*_2 &= \frac{S_d}{4C^{(d)}_D}\sqrt{\frac{k_B^3}{m\pi ^d}}~ \Gamma \Big (\frac{d+1}{2}\Big ), \) 
